23129340 has 72 divisors (see below), whose sum is σ = 70157808. Its totient is φ = 5690880.

The previous prime is 23129339. The next prime is 23129341. The reversal of 23129340 is 4392132.

It is an interprime number because it is at equal distance from previous prime (23129339) and next prime (23129341).

It is a self number, because there is not a number n which added to its sum of digits gives 23129340.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23129341) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9000 + ... + 11280.

It is an arithmetic number, because the mean of its divisors is an integer number (974414).

Almost surely, 2^23129340 is an apocalyptic number.

23129340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 23129340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35078904).

23129340 is an abundant number, since it is smaller than the sum of its proper divisors (47028468).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

23129340 is a wasteful number, since it uses less digits than its factorization.

23129340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2319 (or 2304 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 24.

The square root of 23129340 is about 4809.2972459602. The cubic root of 23129340 is about 284.9187826438.

The spelling of 23129340 in words is "twenty-three million, one hundred twenty-nine thousand, three hundred forty".